These leads are for the show ring only, they are approx 3-4mm thick and made from satin cord so are quite strong and very pretty. These leads have a fixed neck loop which once placed around the dogs neck and tightened will remain fixed in place while in use, it will not tighten like a half check. the "collar" part of these leads can fit upto approx a 20" neck and the "lead" part measures approx 35". They have a single set of 7 sparkly clear glass beads as pictured. The pictures don't do the sparkle justice.